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WU Yao-jin, XUE Yong, DUAN Jiang-nian. Optimization approach hydroforming car beam billets based grey system theory[J]. JOURNAL OF BEIJING INSTITUTE OF TECHNOLOGY, 2011, 20(1): 48-53.
Citation: WU Yao-jin, XUE Yong, DUAN Jiang-nian. Optimization approach hydroforming car beam billets based grey system theory[J].JOURNAL OF BEIJING INSTITUTE OF TECHNOLOGY, 2011, 20(1): 48-53.
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Optimization approach hydroforming car beam billets based grey system theory

  • 1.

    National Key Laboratory of Science and Technology on Electronic Test and Measurement, Taiyuan 030051, China;School of Material Science and Engineering, North University of China, Taiyuan 030051, China

  • 2.

    School of Material Science and Engineering, North University of China, Taiyuan 030051, China;School of Mechanical Engineering and Automation, Beijing University of Aeronautics and Astronautics, Beijing 100191, China

  • 3.

    School of Mechanical Engineering and Automation, Beijing University of Aeronautics and Astronautics, Beijing 100191, China

  • Received Date:2010-03-05
    Abstract
  • Perfect combination of structural size parameters of the hydroforming billets is essential to obtain even wall-thicknesses of the car-beam. Finite element (FE) analysis on hydroforming car-beam was carried out, and the results were optimized according to multiple quality objectives by the grey system theory. With bending angle, bending radius and hight-difference along the axis direction as variables, orthogonal FE analyses were conducted and the minimum and maximum wall-thicknesses of the billets with different sizes were obtained. Taking the minimum and maximum wall-thicknesses as two references, the correlation coefficient between the data for reference and those for comparison by the grey system theory reduced multi-objectives to a single quality objective, and the average correlation level of every billet facilitated the optimization of size parameters for hydroforming car beam. The trial production showed that the optimization approach satisfied the need of hydroforming car beams.
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